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YAML Formatter Online

Paste YAML to pretty print it by normalizing indentation, trimming trailing whitespace, converting tabs to spaces, and standardizing line endings. This tool runs locally in your browser (no uploads).

Category: Developer · URL: /tools/yaml-formatter-online.html

What it does: trims trailing spaces, converts tabs to spaces, normalizes line endings, and (when safe) reindents using the detected indentation unit.

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Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use it to clean YAML without changing content (best-effort). For complex YAML features, review the result before using it in production.

  1. Paste your YAML into YAML input.
  2. Choose an indentation size (2 or 4 spaces).
  3. Click Format.
  4. Copy the result or click Use output as input to iterate.
Keywords this page targets (natural cluster): yaml formatter online, format yaml online, yaml pretty print, yaml beautifier, yaml indentation fixer, yaml tabs to spaces, yaml reindent, yaml whitespace remover, yaml line ending normalize, pretty yaml output, yaml formatter 2 spaces, yaml formatter 4 spaces, fix yaml indentation, yaml cleanup tool, yaml lint indentation, kubernetes yaml formatter, docker compose yaml formatter, github actions yaml formatter, format yaml file online
Secondary intents covered: Pretty print YAML to make it readable, Normalize indentation (2 or 4 spaces) across a document, Convert tabs to spaces to avoid YAML parsing issues, Trim trailing whitespace and clean up line endings (CRLF → LF), Detect and warn about inconsistent indentation, Copy formatted YAML for use in CI/CD, Kubernetes, or config files, Use formatted output as the next input during iterative cleanup, Quickly clean YAML before sharing or committing

FAQ

Is this a full YAML validator/linter?

No—this is a whitespace/indentation formatter with basic indentation consistency warnings; it does not fully parse YAML.

How does the formatter decide indentation levels?

It detects the most likely indentation unit from your file (e.g., 2 or 4 spaces) and reindents to your chosen size when indentation is consistent.

What if my YAML has inconsistent indentation?

The tool warns you and keeps the original indentation to avoid producing YAML that changes meaning or becomes invalid.

Does it support block scalars, anchors, and complex YAML features?

It preserves your text lines and only adjusts whitespace; for complex YAML, always review the formatted result before using it.

Why convert tabs to spaces?

Many YAML parsers reject tabs for indentation; converting tabs to spaces prevents common parse failures.

Is my YAML uploaded to a server?

No. Formatting runs locally in your browser and the tool does not make network requests.

Can I keep my current indentation but still clean whitespace?

Yes—if indentation is inconsistent, the formatter keeps it while still trimming trailing spaces and normalizing line endings.